Revved to chromium 4dfb55c9cf0950b8bac8b10070c9b8f3e7de66c2 refs/remotes/origin/HEAD
diff --git a/ui/events/gesture_curve.h b/ui/events/gesture_curve.h
new file mode 100644
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+++ b/ui/events/gesture_curve.h
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+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_EVENTS_GESTURE_CURVE_H_
+#define UI_EVENTS_GESTURE_CURVE_H_
+
+#include "base/time/time.h"
+#include "ui/gfx/geometry/vector2d_f.h"
+
+namespace ui {
+
+// An abstraction of curve-based gesture motion, allowing platform-specific
+// motion tailoring.
+class EVENTS_BASE_EXPORT GestureCurve {
+ public:
+ virtual ~GestureCurve() {}
+
+ // The output |offset| represents the total movement of the curve from its
+ // start until |time|.
+ // The output |velocity| represents the instantenous velocity at |time|.
+ // Returns false if |time| exceeds the fling duration, in which case
+ // the terminal offset will be reported.
+ virtual bool ComputeScrollOffset(base::TimeTicks time,
+ gfx::Vector2dF* offset,
+ gfx::Vector2dF* velocity) = 0;
+};
+
+} // namespace ui
+
+#endif // UI_EVENTS_GESTURE_CURVE_H_
